Workshop Technology
In a four high rolling mill, there are four rolls out of which

Three are working rolls and one is backing up roll
Two are working rolls and two are backing up rolls
One is working roll and three are backing up rolls
All of the four are working rolls

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Workshop Technology
The purpose of a gate is to

Act as a reservoir for the molten metal
Feed the molten metal to the casting in order to compensate for the shrinkage
Delivers molten metal from pouring basin to gate
Delivers molten metal into the mould cavity

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